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� ENVIRONAI.ZENTAL HEALTH bEPARTMENI <br /> SAN JOAQUIN COUNTY <br /> Program Coordinators <br /> a— <br /> r `?a Donna K. Reran, R.E.H.S. 304 East Weber Avenue,Third Floor Carl Bergman,R E.H.S. <br /> Director Mike Huggins, R.E.H.S.,R.D.I. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Margaret Lagorio, R.E.H.S. <br /> • o4.s?..:P Assistant Director Telephone: (209)468-3420 Robert McClelloq R.E.H.S. <br /> tiFoaN Jeff Carruesco, R.E.H.S. <br /> Fax. (209) 464-0138 <br /> Website:www.sjgov.org/ehd/ FEB 1 taX�gley, R.E.H.S. <br /> JENNIFER SEDLACHEK CONTACT: KEVIN MUEIEKS <br /> EXXONMOBIL OIL CORPORATION PAT & KATHLEEN MEEKS <br /> 4096 PIEDMONT AVE #194 25355 HWY 99 <br /> OAKLAND CA 94611 ACAMPO CA 95220 <br /> RE: Meeks RV (former Pacific Auto Center) SITE CODE: 508378 <br /> 25355 North Highway 99 <br /> Acampo, California 95220 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed analytical <br /> results for groundwater samples collected during the quarterly groundwater monitoring <br /> events from March 1999 through August 2006, as well as historical data from January <br /> 1999, all submitted by Advanced GeoEnvironmental, Inc. (AGE) on your behalf. During <br /> the review process, EHD discovered that it does not have the field logs for soil borings <br /> PI and P2, advanced in January 1999, and laboratory analytical data for grab <br /> groundwater samples collected from soil borings B1 on February 25, 1999, B2 on <br /> February 26, 1999, and B3 on March 1, 1999. Please submit these field logs and <br /> laboratory results to EHD by April 11,2007. <br /> Additional investigation is needed to define the groundwater plume containing 1,2- <br /> dichloroethane (1,2-DCA) currently detected in groundwater samples collected from four <br /> of the five monitoring wells at your site and detected in grab groundwater samples <br /> collected at 135 feet below surface grade (bsg) from cone penetrometer testing (CPT) <br /> boring CPTL Please submit a work plan to EHD by April 11, 2007, that will address the <br /> lateral extent of chemicals of concern (COC) to the east, south, and west of the former <br /> underground storage tanks (UST) as well as the vertical extent of COC at the source area. <br /> AGE recommends in Quarterly Report— Third Quarter 2006, dated January 9, 2007, that <br /> monitoring well MW-2 be sampled annually for the COC instead of quarterly since <br /> groundwater results for all COC have been non-detect since April 2000. EHD concurs <br /> with this recommendation and directs that MW-2 be sampled annually during the first <br /> quarterly groundwater monitoring event. Please continue to collect depth to water <br /> measurements in this well during each quarterly groundwater monitoring event for the <br /> purpose of determining the groundwater gradient. <br /> Tertiary-butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether <br /> (ETBE), and tertiary-amyl methyl ether (TAME) have not been detected in any of the <br />